K. Mukai, K. Nedachi, J. Jamali
Nov 19, 1993
Citations
0
Influential Citations
34
Citations
Journal
Chemical Physics Letters
Abstract
Abstract Magnetic susceptibilities of 3-(4-chlorophenyl)-1,5-dimethyl-6-thioxoverdazyl ( p -CDTV) and 3-(4-bromophenyl)-6-thioxoverdazyl ( p -BDTV) radicals have been measured in the temperature range between 4.0 and 300 K. The susceptibility of p -CDTV follows the Curie—Weiss law with a Curie constant of 0.381 K emu/mol and a positive Weiss constant of θ = + 3.2 K, suggesting intermolecular ferromagnetic exchange interaction between neighboring radicals. On the other hand, the magnetic susceptibility of p -BDTV exhibits a broad maximum at 26.5 K. This susceptibility can be explained by the one-dimensional Heisenberg model with negative exchange interaction of 2 J / k = −41.3 K.